@shonquiz - that was exactly my initial question. Since they have direct access to Illien/Ilmore technology, also on the R&D level, will they adopt their technology.
Reason for questioning, besides the fact that Mario Illien is a kind of Adrian Newey on the engine level, is the status of Renault autosport department.
For a long time rumors have spread around about Renault Autosport being for sale, being closed, at least having an unknown future. With their recent entry as a F1 team these rumours were suppressed, the reluctant cooperation with Illien/Ilmore kind of reopens the rumor mill again, based on their inability to produce a solid top engine on their own strength.
I was wrong including TAG/TAG Heuer in this constellation, initially assuming Heuer was part of the TAG Group (unaware of the LVMH ownership), and TAG historicly was an investor in technology and relevant IP. Heuer likely doesn't have such interest.
Interesting fact: Toro Rosso engines have not yet been confirmed in the 2017 entry list:
http://www.motorspor...ry-list-857403/
So that could still be a Renault or a TAG Heuer badged engine.